Service manual

Printer functions
Printer functions are divided into five groups:
■ Engine control
■ Formatter
■ Image formation
■ Laser/scanner
■ Pickup and feed
The following figure is a block diagram of the printer:
Figure 4-2 Printer functional-block diagram
Engine control system (engine control unit and power assembly)
The engine control system coordinates all print engine activities. The engine control system includes
both the engine control unit (ECU) PCA and the engine-power-assembly PCA.
NOTE In other HP LaserJet products, the ECU and power functions are combined onto one
PCA known as the controller PCA or the DC controller PCA. In the HP LaserJet 1010 series
printers, the control functions are primarily relegated to the ECU PCA, and the power functions
are relegated to the engine-power-assembly PCA.
50 Chapter 4 Operational overview ENWW